@article{DAN_1964_156_5_a7,
     author = {Yu. A. Dubinskii},
     title = {The first boundary-value problem for degenerate quasi-linear elliptic systems of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1018--1021},
     publisher = {mathdoc},
     volume = {156},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_5_a7/}
}